arachnoid villi

arachnoid villi
1. granulationes arachnoideae. 2. numerous microscopic projections of the arachnoid into some of the venous sinuses, which are thought by some to enlarge in persons with advancing age to become the granulationes arachnoideae (q.v.).

Medical dictionary. 2011.

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  • Arachnoid granulation — Infobox Anatomy Name = PAGENAME Latin = GraySubject = 193 GrayPage = 878 Caption = Diagrammatic representation of a section across the top of the skull, showing the membranes of the brain, etc. ( Arachnoid granulation label is at top right.)… …   Wikipedia

  • arachnoid villus — n ARACHNOID GRANULATION * * * one of the thin walled projections outwards of the arachnoid membrane into the blood filled sinuses of the dura, acting as a one way valve for the flow of cerebrospinal fluid from the subarachnoid space into the… …   Medical dictionary

  • arachnoid granulation — n any of the small whitish processes that are enlarged villi of the arachnoid membrane of the brain which protrude into the superior sagittal sinus and into depressions in the neighboring bone called also arachnoid villus, pacchionian body …   Medical dictionary

  • arachnoid villus — one of the thin walled projections outwards of the arachnoid membrane into the blood filled sinuses of the dura, acting as a one way valve for the flow of cerebrospinal fluid from the subarachnoid space into the bloodstream. Large villi, known as …   The new mediacal dictionary

  • villus — 1. A projection from the surface, especially of a mucous membrane. If the projection is minute, as from a cell surface, it is termed a microvillus. 2. An elongated dermal papilla projecting into an intraepidermal …   Medical dictionary

  • Dura mater — Meninges of the CNS Gray s subject #193 872 MeSH …   Wikipedia

  • meninges — meningeal /mi nin jee euhl/, adj. /mi nin jeez/, n.pl., sing. meninx /mee ningks/. Anat. the three membranes covering the brain and spinal cord. Cf. arachnoid (def. 6), dura mater, pia mater. [1610 20; < NL < Gk méninges, pl. of MÊNINX membra …   Universalium

  • Villus — (Latin: shaggy hair [http://www.tiscali.co.uk/reference/encyclopaedia/hutchinson/m0035419.html] Tiscali UK Reference encyclopedia] , plural villi) can refer to: * Intestinal villus. This is the most common meaning when not more precisely… …   Wikipedia

  • Granulation — That part of the healing process in which rough, pink tissue containing new connective tissue and capillaries forms around the edges of a wound. Granulation of a wound is normal and desirable. * * * 1. Formation into grains or granules; the state …   Medical dictionary

  • granulationes arachnoideae — [TA] granulationes arachnoideales arachnoid granulations: small elevations, visible to the naked eye, thought by some to be enlargements of arachnoid villi, which project into the superior sagittal sinus and associated venous lacunae and create… …   Medical dictionary

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